Moisture vapor permeable film including ethylene copolymer and articles including the same

Abstract

A continuous film that includes ethylene copolymer selected from the group consisting of ethylene vinyl acetate, ethylene n-butylacrylate carbon monoxide, ethylene vinyl acetate carbon monoxide, and combinations thereof. The film exhibits a moisture vapor transmission rate of at least 100 g/m 2 /day when measured according to MVTR Test Method I.

1. A continuous film consisting essentially of ethylene vinyl acetate having a melt index of at least 50 g/10 min at 190° C., said film exhibiting a moisture vapor transmission rate of at least 100 g/m 2 /day when measured according to MVTR Test Method I. 
     
     
       2. The film of  claim 1 , wherein said ethylene vinyl acetate has a vinyl acetate content of from about 40% by weight to about 85% by weight. 
     
     
       3. The film of  claim 1 , wherein said ethylene vinyl acetate has a vinyl acetate content of from about 60% by weight to about 85% by weight. 
     
     
       4. The film of  claim 1 , wherein said ethylene vinyl acetate has a melt index of at least 400 g/10 min at 190° C. 
     
     
       5. An article comprising:
 a first layer; and 
 a second layer comprising the continuous film of  claim 1  bonded to said first layer. 
 
     
     
       6. The article of  claim 5 , wherein said film has an area weight of no greater than 25 g/m 2 . 
     
     
       7. The article of  claim 5 , wherein said film has an area weight of no greater than 15 g/m 2 . 
     
     
       8. The article of  claim 5 , where said first layer is selected from the group consisting of a fibrous nonwoven web, paper, tissue, fibrous web, textile fabric and combinations thereof. 
     
     
       9. A continuous film consisting of ethylene copolymer selected from the group consisting of ethylene vinyl acetate, ethylene n-butylacrylate carbon monoxide, ethylene vinyl acetate carbon monoxide, and combinations thereof, said ethylene copolymer having a melt index of at least 50 g/10 min at 190° C., said film exhibiting a moisture vapor transmission rate of at least 100 g/m 2 /day when measured according to MVTR Test Method I. 
     
     
       10. The film of  claim 9 , wherein said ethylene copolymer consists of a blend comprising a first ethylene vinyl acetate copolymer and a second ethylene vinyl acetate copolymer different from said first ethylene vinyl acetate copolymer. 
     
     
       11. A continuous pressure sensitive adhesive film consisting essentially of:
 at least one ethylene vinyl acetate copolymer having a melt index of at least 50 g/10 min at 190° C.; 
 no greater than 50% by weight plasticizer; and 
 optionally antioxidant, said film exhibiting a moisture vapor transmission rate of at least 100 g/m 2 /day when measured according to MVTR Test Method I. 
 
     
     
       12. The film of  claim 11 , wherein said ethylene vinyl acetate copolymer has a vinyl acetate content of at least 40% by weight. 
     
     
       13. The film of  claim 11 , wherein said ethylene vinyl acetate copolymer has a vinyl acetate content of at least 60% by weight. 
     
     
       14. The film of  claim 11 , wherein said at least one ethylene vinyl acetate copolymer comprises a blend comprising a first ethylene vinyl acetate copolymer and a second vinyl acetate copolymer different from said first ethylene vinyl acetate copolymer. 
     
     
       15. A continuous pressure sensitive adhesive film consisting essentially of:
 ethylene vinyl acetate copolymer; 
 no greater than 50% by weight plasticizer selected from the group consisting of phosphates, polyalklylene glycols, dionyl phenol ethoxylates, ethoxylated bisphenol A, phosphites, toluene sulfonamide, and combinations thereof; and 
 optionally antioxidant, 
 said film exhibiting a moisture vapor transmission rate of at least 100 g/m 2 /day when measured according to MVTR Test Method I. 
 
     
     
       16. A continuous pressure sensitive adhesive film consisting essentially of:
 ethylene vinyl acetate copolymer; 
 plasticizer comprising a citric acid ester, a benzoic acid ester, or a combination thereof; and 
 optionally antioxidant, 
 said film exhibiting a moisture vapor transmission rate of at least 100 g/m 2 /day when measured according to MVTR Test Method I. 
 
     
     
       17. An article comprising:
 a first layer; and 
 a second layer bonded to said first layer, said second layer comprising a continuous film consisting essentially of ethylene vinyl acetate having a melt index of at least 50 g/10 min at 190° C., said film exhibiting a moisture vapor transmission rate of at least 100 g/m 2 /day when measured according to MVTR Test Method I, and wherein said film has an area weight of no greater than 25 g/m 2 . 
 
     
     
       18. An article comprising:
 a first layer; and 
 a second layer bonded to said first layer, said second layer comprising a continuous film consisting essentially of ethylene vinyl acetate having a melt index of at least 50 g/10 min at 190° C., said film exhibiting a moisture vapor transmission rate of at least 100 g/m 2 /day when measured according to MVTR Test Method I, said film having a thickness of up to 2 mil. 
 
     
     
       19. The article of  claim 18 , wherein said ethylene vinyl acetate has a vinyl acetate content of from about 40% by weight to about 85% by weight. 
     
     
       20. The article of  claim 18 , wherein said ethylene vinyl acetate has a vinyl acetate content of from about 60% by weight to about 85% by weight. 
     
     
       21. The article of  claim 18 , wherein said ethylene copolymer consists of a blend comprising a first ethylene vinyl acetate copolymer and a second ethylene vinyl acetate copolymer different from said first ethylene vinyl acetate copolymer. 
     
     
       22. The article of  claim 18 , wherein said ethylene vinyl acetate has a melt index of at least 400 g/10 min at 190° C.